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    Commercial Audio 120W 5ch 100/70V Mixer Amp with Microphone Priority (NO LOGO)
    Product # 14886
    Wattage: 120W
    120W 240W 60W
    In Stock This item will ship on 1/22/2018 if ordered within 2 days 14 hours 50 minutes

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    Commercial Audio 120W 5ch 100/70V Mixer Amp with Microphone Priority (NO LOGO)

    Simplify the task of running distributed audio for restaurants, hotels, or anywhere large areas need background music and/or paging address systems. Connect hundreds of speakers covering acres of area without the need for large equipment racks.

    A constant voltage speaker system differs from a traditional 8-ohm speaker system in that it uses a step-up transformer at the audio source to raise the voltage and lower the current on the transmission line. At the speaker end, a step-down transformer converts the signal back to a normal speaker level voltage. This reduces power loss during transmission, which allows for the use of longer speaker wire runs using smaller gauge wire.

    Additionally, a constant voltage speaker system allows for the use of multiple speakers on each channel, without the need for complicated impedance calculations and configurations. In a constant voltage system, all speakers on a given channel are connected in parallel and the complicated impedance calculations are replaced by simple wattage calculations.

    For example, if you want to connect two speakers per channel in a traditional 8-ohm speaker system, you must either connect them in series, which results in an overall 16-ohm impedance, or in parallel, which results in an overall 4-ohm impedance. In the first case, the 16-ohms impedance effectively halves the output power of your amplifier, resulting in lower overall volume levels. In the latter case, the 4-ohms impedance means that your amplifier will have to work harder and must be rated as stable at 4 ohms. Adding a third speaker to the mix would complicate it further, producing either a 24-ohm or 2-ohm overall impedance. Note that very few amplifiers are stable under 2-ohm loads, so that is usually not an option.

    On the other hand, with a constant voltage system, you consider first the RMS output wattage of the amplifier. This should be reduced by 20% to compensate for insertion loss. For example, if using a 100-watt amplifier, the total load from speakers should not exceed 80 watts.

    This amplifier features three microphone inputs and two auxiliary inputs, each of which is active and mixed into the line and speaker level outputs. When an EMC input trigger is detected, all outputs except MIC 1 are muted, allowing for the clear broadcast of important messages. The amplifier can drive a speaker array consisting of one or more speakers presenting a 4~16 ohm load or to one or more 70V or 100V speakers connected in parallel as part of a large public address system.


    • 5-channel (3 microphone and 2 line) mixer/amplifier
    • Amplifier rated for 120 watts
    • 70V, 100V, and low impedance 4~16 ohm speaker output options
    • Built-in rack mount ears and 2U height for mounting in a standard 19" equipment rack
    • Unbalanced front panel input for MIC 1
    • Both balanced XLR and unbalanced TRS and RCA rear panel inputs for MIC 2 and MIC 3
    • Phantom power option for MIC 2 and MIC 3
    • Two unbalanced RCA auxiliary/line inputs
    • One EMC priority input
    • Master volume, bass, and treble controls
    • Front panel level controls for all inputs
    • 0-30dB variable muting for all channels except MIC 1 when MIC 1 is in use
    • Built-in short circuit, over-current, and high temperature protection circuits
    • Line level output of mixed signal for connection to other devices

    Audio Bundle

    Model 14866
    Speaker Outputs Low impedance (4~16 ohms), Constant voltage (70V or 100V)
    Inputs MIC 1: unbalanced 1/4" TRS, 5mV, 600 ohms
    MIC 2-3: Unbalanced TRS, balanced XLR, 5mV, 600 ohms
    MIC 2-3 LINE: Unbalanced stereo RCA, 775mV, 10 kilohms
    AUX 1-2: Unbalanced RCA, 350mV, 10 kilohms
    EMC: Unbalanced EMC, 775mV, 10 kilohms
    Bass Adjustment ±10dB at 100Hz
    Treble Adjustment ±10dB at 10kHz
    Frequency Response 50Hz ~ 16kHz
    Signal-to-Noise Ratio MIC 1-3: 66dB
    AUX 1-2: 80dB
    THD < 0.5% at 1kHz, 1/3 rated power
    Crosstalk ≤ 50dB
    Muting Function Automatic 0-30dB reduction on all inputs except MIC 1 when MIC 1 is active
    Protection Short circuit, over-current, overheating
    Input Power 100~120 VAC, 50/60Hz
    Power Consumption 200 watts
    Dimensions 19.1" x 13.2" x 3.5" (484 x 335 x 88 mm)
    Weight 20.5 lbs. (9.3kg)

    Support Files:

    Start typing your question and we'll check if it was already asked and answered. Learn More
    Browse 9 questions Browse 9 questions and 15 answers
    Building out a doctor's office with approximately 24 in-ceiling/in-wall speakers for background noise. Will your 120W amp work for this scenario? Will I need to purchase an additional step-down transformer on the speaker end that convert the signal back to a normal speaker level ?
    New User U on Dec 11, 2017
    BEST ANSWER: Enter an answer to this question.Hi. I am a professional AV installer. If you have installed “regular” (non-70volt) speakers this amp will not work for you. Take a look at the speakers you’ve installed. If there is a copper coil transformer on the back then you’ve installed 70 volt speakers. If the wire leads attach to the speaker coil without a transformer then you have regular 4ohm or 8ohm speakers. If you have 4ohm-8ohm speakers you will need a regular amplifier and need to be mindful of how many speakers you run on each channel.
    Im looking to run 15-20 6 in jvc 8 ohm speakers with transformers. what size should i consider, 120w or 240W?
    New User U on Sep 11, 2017
    BEST ANSWER: Thank you for your interest in our commercial audio products. The manual for this product is available for download from the product page. It explain how the math for 70V speaker works in a safe manner. Basically when you decide what power tap you want to use for each speaker. Most transformers will give you 2-4 options. If the JVC's are 30W RMS @ 8Ω the you may have 30W, 15W & 7.5W taps. Let's say you use the 15W tap on 15 speakers then the total power from the amplifier will be 225W. Any amp running 70V should only run 80% of max power to ensure long uninterrupted service. Our 240W models should only run 192W max. You will need to run some at 7.5W like lavatories and shorter ceiling areas so people are not blasted.
    Will it struggle with heat when used with 2 100 or 200 W - 70 volt outdoor speakers?
    Michael W on Apr 24, 2017
    BEST ANSWER: This amp is only rated for 120W. It is better for long term use to give your self 20% headroom. This means your should only run about 98W total power. For 2 x 100W horns you should look at out 240W version of the mixer/amp.
    Commercial Audio 240W 5ch 100/70V Mixer Amp with Microphone Priority (NO LOGO)
    Commercial Audio 240W 5ch 100/70V Mixer Amp with Microphone Priority (NO LOGO)
    My audio sources has 200mv balanced output. Will it overload the XLR inputs?
    Connie T on Aug 28, 2017
    BEST ANSWER: A millivolt is a thousanth of a volt, so 200mv is 0.2v. I wouldn't plug an audio source into the microphone xlr inputs. Use the auxiliary that is on the system. I believe there are 2 or 3 inputs that are labeled for aux.
    What is the warranty of this unit? I can not seem to find it on the website or in the user's manual when downloaded.
    Michael S on May 22, 2017
    BEST ANSWER: Thank you for your interest in our Commercial Audio products. This is an over site that will be corrected. All Monoprice components have a 1-year warranty.
    I have a 2000 sq ft office and I am looking for a system to run background music. It has 6 rooms and I would like 6 in ceiling speakers. How do recommend I build a music system for this need?
    Jimmy A on Feb 1, 2017
    BEST ANSWER: Our Commercial Audio 120W 5ch Mixer/amp is a great choice for this exact scenario. You can easily connect 6 of our Commercial Audio 70V Ceiling speakers in parallel to the 70V output. Use 14888 4" speakers for size limitation or 14887 6.5" speakers if you want better bass response. Connect your music source to the RCA's on the back and enjoy the music. You can plug our 14891 paging mic to the front mic input if you need to make announcements and the music will automatically attenuate until you are finished.
    4.8 / 5.0
    6 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    I bought 3 of this for retail store
    I bought 3 of this for retail store and they worked great! You can beat this price anywhere! I wish they have more of this items in stock so I can get more!
    March 14, 2017
    1 year ago
    This is nothing fancy but does the job. Replaced old Bogan amplifier for a softball complex. Coaches and team are satisfied.
    July 1, 2017
    7 months ago
    Great amp, wish it had pass-through
    I'm using this amp to drive an exterior 70v set of speakers in my back yard. It works like a charm, and looks great. It has an internal fan that kicks on when you get up to more serious amplification, but unlike another amp I tried, it stays whisper quiet at normal levels.

    The only thing I wish it had, is a pass through of the input sources. The RCA stereo outputs are amplified as well, which seems like an odd choice. To compensate, I added a $14 splitter on the input source, so the audio could also feed to my interior sound system.
    July 16, 2017
    7 months ago
    Just what I needed
    Bought this Amp for a really cheap customer. To my surprise this amp blew me away. Works great. For the price you can't beat it. I will be buying this amp again. Works very well with 70v speakers and sub.
    July 13, 2017
    7 months ago


    In Stock This item will ship on 1/22/2018 if ordered within 2 days 14 hours 50 minutes